Characterization of {sup 3}He area sensitive proportional counters at IPNS for SANS applications

Conference · Tue Sep 01 00:00:00 EDT 1992

OSTI ID:10169984

Thiyagaragjan, P; Crawford, R K; Epperson, J E; Wozniak, D G; Carpenter, J M ^[1]; Bradley, K F ^[2]

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1. Argonne National Lab., IL (United States)
2. Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Nuclear Engineering

The Small Angle Diffractometer (SAD) at the Intense Pulsed Neutron Source (IPNS) utilizes a 20 {times} 20 cm{sup 2} Borkowski-Kopp type {sup 3}He position sensitive detector (PSD) which has reliably performed small-angle neutron scattering experiments for more than a decade. The pulsed-source based SAD employs a small, but fixed, sample-to-detector distance and a pulsed polychromatic neutron beam. The neutron energies are resolved through time-of-flight (TOF) measurements so that a much wider range of momentum transfer is probed in a single measurement compared to the range of spectrometers using monochromatic incident beams. However, the pulsed source requires a short sample-to-detector distance so that the detector covers a large solid angle, but with lower angular resolution, and this situation puts stringent demands on the spatial resolution of the detector. Previously, nonlinearities in the position encoding of detected neutrons required that the outer channels of the detector, representing 40% of the detector area, be discarded. This paper presents a technique to characterize both the position encoding and the position resolution of the entire detector so that the whole detector can be used for SANS measurements.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10169984
• Report Number(s): ANL/CP-76585; CONF-920792-22; ON: DE92019041
• Resource Relation: Conference: 37. annual Society of Photo-Optical Instrumentation Engineers (SPIE) international symposium on optical and optoelectronic applied science and engineering,San Diego, CA (United States),19-24 Jul 1992; Other Information: PBD: [1992]
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
07 ISOTOPES AND RADIATION SOURCES
HE-3 COUNTERS
SPATIAL RESOLUTION
NEUTRON SOURCES
DIFFRACTOMETERS
SCATTERING
TIME-OF-FLIGHT METHOD
POSITION SENSITIVE DETECTORS
NEUTRONS
PERFORMANCE
440103
070201
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
DESIGN, FABRICATION, AND OPERATION